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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8edc13f0541dfa55612ccf1e6a7f19f1b9d23e34a7046eb393ce0e90cf92308b' 
  AND token = 'p7aP03KsoDeJ5gclb/MQ2JGGpLIo7Svo7xV1gwAXoN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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