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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caeb8a6e6cdaafc81886fdde30409659cb4e98b8d4e8eeedf2840035fd6d0d94' 
  AND token = 'zzbp9MZNBkxreFZNq0XAp3hDR+7DcDaegOanf4zMr+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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