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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5c8c916eab8607fa86dbe550b327d5c4775e7c0c2aabe11ef3a65637d23eb7' 
  AND token = 'Q/wJy5amL+kD0BNa0+ThKvd6RbDrlgUTlqE6as0n+04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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