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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93b871fc258dad5f30b7c66f2fb077ed321cdcb1ecaf56e763ee1e38e426f38' 
  AND token = 'F/JUgO1APBZ9SPz0c23YayI6xV70WmIRp79MLj2UnBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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