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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e334f30dcf9edf3763325c92598b8846e6018c15fcbd058b64c8dd0594cefb' 
  AND token = 'U6436xKexraPWvnuwJtU8y+a0cnD+aDEnXOmtsIZi10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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