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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd444af3b7c6b91ce4637f90a2125428afc79fad7087b810088d79af95d25dc8a' 
  AND token = 'CvkSmYdE2xIIwcTi6J4y4rrFqPryhRSD8FHEPqYovCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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