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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dcab1b81dd7bb8a9e81206b1bd2dbceeea7e648638f345a531d2dcd10207a5e' 
  AND token = '9NxN9n45+hEaQec3w/4yCk8vIvbs8I9iJbgNy95oW3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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