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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9776d65ed39655879fd72c1a66279d1ea5494ea9859a759d3dec57bcbc8e4292' 
  AND token = 'ndwNqYihQ4oRXUdhfJeZiQvdbSQZR4dnBWoxwtArXYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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