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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88ea917fedc64a41c16c70ec2f188489cdb7f9e18e51cb030aa3404af8ab4ff' 
  AND token = '6SalWSSBnzk9s41Aw1GkrgF/eT3WOLT34Cpv/fl4VbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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