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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ae4e8789e6638d75a3b33451c8796d7de397d0a868be7d12a78e7577921f9e' 
  AND token = 'ppcN7O1DaOqcBSSKSiqrWgoHHUs1t3X6qav5kRuhYBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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