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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da51aa8b31ecdef10de16296f2f612cf3c01128892f8d4bcc994fdc64aefd83' 
  AND token = 'Xalb0KkOG9NTPBMocXXaE7f638MTH+P5HVpoy2qQquc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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