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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9fab6522a546e40d48950ffce876b77f936880c1587c22bef57ad8de91b7563' 
  AND token = '5WFO2sM8g5b6S3cdmO1z1KfGckuxMqGTItW3MmsSTHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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