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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abffdc36243e80b31d3bff293faa0ca1845e19b01ce0f4ae720c9d784ae60b5b' 
  AND token = 'WEMUC7M5EgappDCGlUPxySwXdu1dUmBnkK4F9cGr9jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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