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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301bdb62bf0475c620c9e9be545939506f3e8cdaa9302e0aa46b3bb83ebb3f31' 
  AND token = '3Oc/Asd6T0y9BsQUEkgHAPxc5VwH60BYTTyCwrautTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}