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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695a3d51be96683797494217f1e1f259dd235496d2468c6f2a15f16c22a8c04a' 
  AND token = 'PHBihSsC4Bg6NgT9Reu0wtag95OFstwa/HuUHTW0B2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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