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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f8fae03c4ce97128a2ad88c6a55b73cab35973d3e3de75fc97e808f3c13323' 
  AND token = 'ooiXFd8i0SKG0JwDKVRF8d2vqMfqeaCgpr6/5tyaq+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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