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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ca3325be39a56b7e7404419155a1bfeba31eb84cedbd3bc63b6cb105b91163c' 
  AND token = 'WG57j4DqU4eEDp6MfjS+HvTwXZ9T+fmiqfPghRcgnDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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