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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3847dd42f2fffbd8a78654c2491a77ff6a0379abd1cf5e4489e2bc543f5c9ed3' 
  AND token = 'gKNbjNdxFc+Ci5lE+100QLB1WDeRnVDg6XRfEwlvWck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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