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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7760d30e5dcd8bc835ed0017328af19baa8a45736368d91ba97f662fbcafb02' 
  AND token = '5/123REdP8F1xYmkEsWHlcl1ebQdCH+git6FBtE/xBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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