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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a7246d7b129008431c50b5e5ecb4d65c7b0384901e46424f12c794d5dcbb6b' 
  AND token = '7Co+Qg/3rD9AxIrXfk13crAhoJakfPk1rnFXJ/hMAqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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