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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9b03b9dbba7d24e9d79dc91766417d9ec626df2285c80f0da901ec872e3a1b' 
  AND token = 'kDQTTTwP4hEI2PNtSzhL+qbZvbrWgWUy+FucV6G/J1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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