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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd185b3e96250f221379a57d3618c9320f1075e3b4e2a2eb856aa2883e64fa760' 
  AND token = 'sDCf0EaREvi0XukrDcIaBPvf8gjMvEhZUye8UTii1t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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