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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca0c4bcb6953908f4d729ede7180bb02b109fdb149256e1497d6aa2daa84e8f' 
  AND token = 'B7hJBPpP0er9I708RBJQuxM9srK8muE7tzD1wwYbfIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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