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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '166e003337d5fb76ac900f9f0e81e3725ee221928e5a8f6419420869f4fac6fa' 
  AND token = 'ehh0mHV1izYAZNrTSmFJrz1X8hXnimRFQZ0yRezJ4qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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