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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0daf56f4d013a512155e36b7f98e3d0538946e0479eabbf64690f78c21846a7d' 
  AND token = '/l1wtQH5f3G6BmnsmZbW9VJ2K9IUWncfkNuuaCr83Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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