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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ca8806b7cce9c656c19eb2c23c7052a7077d42fc604a06e6ae895a6d3dd7e0' 
  AND token = 'h0PfY6aZcBlfPd8ap530U9kfMcwoCGUCSVp+mBqOSm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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