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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda244208396efc097f8321cf958733c09735f6d192a125553d17a5cd4b78e65' 
  AND token = '9ZktDiaU9FYmETZ+BsvXD2qtuNyZY+arps7o/Dzki+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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