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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd828d1edb7069e1c2834daf4c2f5912ef7bc0d220d822fe3a05f637b0febaba7' 
  AND token = 'PUN+XLfcLw04ZwG7YN94s297V1hTBuO6096zzrx5Al4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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