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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874a567cd2fef3a24eb14e59cf588a2009b9e9af1d7256775e2fcbbf11e20e5a' 
  AND token = 'g+JQlJJT+YxH8pJFJ3YTn/4nZRV8wRYP8olInPemWek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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