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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d3cb66772d8a8436200ad2b066c77639e8a22c397837891479350c2648b94b4' 
  AND token = 'Xrj4GGwfGs7VeLG4AzCIFJlppTFDd0Nh1rL3dPNeID4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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