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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33936f94cb4cb949c10b2cc45f94eae211fcc83bc96ec50a356bfd5b0a3474e6' 
  AND token = 'NaJ2MRxw6JMyrtnTkV7wUgKJU4Ng/R+g58nRChkLH4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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