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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f079aa45bb086c8087caf32140c1ab657d5219fccd418975771aa14760f01c85' 
  AND token = 'cIuGhNxyN2n5Mk89nvbKxqL8biTKe3xBM6Lfv4Xp3io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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