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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a934a0db951d669e516517788cd12db9138d6b404ebd589014f048f763d43af' 
  AND token = '8thLt/0sZaVOVkCEvu1oJkPdaili8bny2km1+0e0XvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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