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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ea48b2972d899996a2467d645286f4766466d5d496b24e3e3aab4e54196ad0' 
  AND token = '7L5AnTeJlHyzW5JyKR+su/UnVenh4IGGszDvl1oRXUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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