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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ea17a2d860dc912362852a814102c7a99865c18026ffb4970871badcfdaf947' 
  AND token = '66B5LFihFOVriU46UZN1UgOJOymW8Ybb3081oc/vRcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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