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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ccd1658d95ab836a7ea7898eb0ef5b82e19572a833f29a5a16ad25e53d0682' 
  AND token = 'ON5pjR1pLcmvJhvzMjBCzPAHJyPUH8x9yMXmThmA9CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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