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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77f2a8a866ec1a95c2b240f92fbe05cd93d79b14e713d793742ef3ff97fefc6' 
  AND token = 'oC8u3I/omxdjuEhtyBCJpyK2l45L75DH5ONV4b4MsOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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