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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01d8463a67ef58275213d0b41c1b3cdc4c04ee93ed104747517d24dd62382f34' 
  AND token = 'XsVgzVi17z5OOv8qv1pSIeJriv6bKK4h+9b/cJRpj/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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