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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f66a6f3737cd42fc8c60b739a1b34b4bd27314664da4f824fefaa0a93dd952d' 
  AND token = 'e//m3VwjR2bgloy3nKrGK56IJJ5lLLiDe/ydhQ5gAnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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