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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f7848b652eb0d608a5776c5429a3140351be255d6e5ea74bf0fbae229cb0ed' 
  AND token = '6JkMS+O97mScYvDcbHbFhpnXO/lQOJYjYV42INyLe4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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