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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e713d3b64350401c6d43074e251aee649abf525f2371d3233fd0fb0f432055' 
  AND token = 'BG06k71WIp+rMg/+m/siSE4pCxsK5Ge/qa4/w854ijY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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