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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f9c51da78c1e3e102dd0182cbfc9c26e39f7688d18d3a24ac48eda2a7ad2d2' 
  AND token = 'aw8k8pWb6CK2e2VHVqL7QYeYUxDtEIjWv1n7AAHPhHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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