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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe4962d346130393ac3db8eec25c1931738857aa6774b5d3017e5fd966b16c0c' 
  AND token = 'xb3qg7oLribJs651PM8zNVVFVWouV+Bm7queyx23p+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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