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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d8aff82ceee0ec902a32c6b0b16f4dcef21bc42ec8152eea754e2923917015' 
  AND token = '5WIQzNKUwEt7Y2FvrSY/4FLaYLHTBge3pdxlQdmAJHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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