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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2ea3cb19d98442a66218cbe9e143dd7da20226fb66bb02a8cea6db81435f96' 
  AND token = 'Q6mABoMeGWmTaYyZmuoG/a7103yrF/bFygbyrO1y5z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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