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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917e15d670dbec73d9bcb95a3f76e0c2b9b23c365054c63afd0ebcc20253398d' 
  AND token = 'mKUw++m+ptmF/rShFLBFaHE9UpJad5m+VHfILr+C+os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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