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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8107416528de8d0aa3d69909fe6736d93542de6746f8b43d54dd78336f9016f4' 
  AND token = 'Qy4nENzRmU32cDpoDVTo3ejnlHhlFRw2vNBB5KwKDIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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