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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9679d4a2154b9333ec5c71254a9ef985410a951e956b5ddbb2f648750cf5d4e5' 
  AND token = 'MoC8fO3GjWV+D8hRsgGni+/uXiUtCYUCPBdBeMcC1t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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