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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cedbf47ae6152dcc5e8d74da09a7872141e3ff99eb107b64a6d704099c26c2a' 
  AND token = 'MYNyWZcl0GX0m7xsYYmhnpkRW4g0Qs/4ZYGujna+V6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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