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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8684de427ff3496787520b4fe98f3c84ee43cfcbd62bb62602bdde137d615d0c' 
  AND token = '21OqfajrQpJ4Rw2In9uRc2eOcr8aWp4MCbTCnCjty0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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