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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760f7d146bf42ff0f2fcfb548239a3f9e05de5738fdda3df860a3e6904878b29' 
  AND token = 'aVn2eVGjoAvDlCiel01svKXncP9p7ID74sycYWcDKM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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