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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732d9cbc67b567b421265ff7c840ac1e0ac937788c59b564a1f3410f1f0b2026' 
  AND token = 'z5433KiwiEGKMFW4+f2wWxmfS6oenqi3ktZ/mm/SN5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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