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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6148f5895ba606c0f5fb3d29026db8f5ce40edede71f6912d06abb68e6ad4f20' 
  AND token = 'gi616UOBNpTG52+woPJ651SRD7yakqf90y2KQ2xZGx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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