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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77712431bf0e16dcfb2dbde5e150c1cc72c74a828d920e17d5968286ecc3f7c8' 
  AND token = 'tgryf5XdXINnXqHVFLfGPtV/znNMx38HvC5O9bsMw/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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