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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8b4477eeb9a19cbe399ca037d4cb2df0342f687aff309009e758d70c87723a' 
  AND token = 'Jb4fktw0Co8IwMvYkEL44ExFJbK0bQZh5pmzwNItqvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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