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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03daf2019a7e97a525a8d41489f99d10550b68e38c5271c1b7968c62ac3d03aa' 
  AND token = 'AZ34TnyOh/WSKLs4tzc4XuLqQMxQZqWXpuq2gb/YdyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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