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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '667a6f565fcef417eadd24c60c7d6d36e730a9760c0ba3fc41a36e25351593a8' 
  AND token = 'Z37uCBUcJj5TlKx4RTYaSNtM+Jr583CxoTJgpwFK8PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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