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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed0bc70e1d239a2d692c3e8b06dbbf58f9e032377dd1800c3dcbbe2c3ea26c32' 
  AND token = '522OpceEMnw1rrnHG3AhUgCY6/qv98MTHSUfeRdepOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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