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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41da17f07282493011d58befc22d3c58da13b4f19555a10165ae95feb61cf113' 
  AND token = 'ytFnuzovCcudy0iNANbGUaKzfq8FaoZiBPs6lhpIug4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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