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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc590e23a93f3031e0f61545fd88417361a84f59c01e381989c2dd213789994' 
  AND token = 'dbHLdejNxIocwhQjBYY70Vq82C70fp8WMVoI/mND1wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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