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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d7482683a53a4e50e5c63fc384ed4e6d2a5bab8350a23db8af563a670b5714' 
  AND token = 'e34kuteNfiWrjFhWDv3R8nR6T5J2YB6PxBXqFTbnY7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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