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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7168ad673e09dc0d8b0f9aac5a859dd8eac52fb2caf233ca97016f6fc02c8591' 
  AND token = 'oGsWWHCHce9IjRMhRv7xl9KQCC9DXBOtJtO1JRwACsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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