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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c45aacb738c477b8ec55b182cb895c0807396a2504574ed5015ae87428dd423b' 
  AND token = '10AtH2xmt9VNAU569ZfenyE+NlcYl5EmQBzjOh9iMsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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