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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9febbcd006eeb24d703c5584af15d906268d1421ac2dc25048cfd57d309ce8ea' 
  AND token = 'noQdxtSVTmJqE/+EO3uFfyFVNWKrBcDEzR0daJT6TdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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