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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5928df5f6a9570541d8ddff25916ec5863648e41dd9b4eb251a0206d174b696c' 
  AND token = 'A8kX6WNib8g5mp3MtBVixpQL8cCFVkFxhdR1B0meEdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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